Honolulu police want to speak to a man who came to the aid of a woman during an attempted sex assault on the University of Hawaii at Manoa campus Sunday.

The victim was walking near the William S. Richardson School of Law at about midnight when she was grabbed by a male and thrown to the ground, police said. While the victim and suspect struggled, an unknown male came to the victim's aid and helped her escape.

The witness is in his 20s, with blond hair and a medium build. Police said he was wearing a white T-shirt and shorts.

Anyone with information about this case is asked to call HPD's Criminal Investigation Division at 529-3115 and ask for Det. Dwight Sato.